<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>灯光效果</title>
	</head>
	<style>
		* {
			margin: 0;
			padding: 0;
			box-sizing: border-box;
			font-family: 'fangsong';
		}

		body {
			height: 100vh;
			display: flex;
			align-items: center;
			justify-content: center;
			background-color: rgb(0, 0, 0);
		}

		.item {
			position: relative;
			margin: 50px;
			width: 300px;
			height: 80px;
			text-align: center;
			line-height: 80px;
			text-transform: uppercase;
			text-decoration: none;
			font-size: 35px;
			letter-spacing: 5px;
			color: aqua;
			overflow: hidden;
			-webkit-box-reflect: below 1px linear-gradient(transparent, rgba(6, 133, 133, 0.3));
		}

		.item:hover {
			background-color: aqua;
			box-shadow: 0 0 5px aqua,
				0 0 75px aqua,
				0 0 155px aqua;
			color: black;
		}

		.item span:nth-of-type(1) {
			position: absolute;
			left: -100%;
			width: 100%;
			height: 3px;
			background-image: linear-gradient(to left, aqua, transparent);
			animation: btnanmaiton 1s linear infinite;
		}

		@keyframes btnanmaiton {
			0% {
				left: -100%;
			}

			50%,
			100% {
				left: 100%;
			}
		}

		.item span:nth-of-type(2) {
			position: absolute;
			top: -100%;
			right: 0;
			width: 3px;
			height: 100%;
			background-image: linear-gradient(to top, aqua, transparent);
			animation: two 1s linear infinite;
			animation-delay: 0.25s;
		}

		@keyframes two {
			0% {
				top: -100%;
			}

			50%,
			100% {
				top: 100%;
			}
		}

		.item span:nth-of-type(3) {
			position: absolute;
			right: -100%;
			bottom: 0;
			width: 100%;
			height: 3px;
			background-image: linear-gradient(to right, aqua, transparent);
			animation: three 1s linear infinite;
			animation-delay: 0.5s;
		}

		@keyframes three {
			0% {
				right: -100%;
			}

			50%,
			100% {
				right: 100%;
			}
		}

		.item span:nth-of-type(4) {
			position: absolute;
			bottom: -100%;
			left: 0;
			width: 3px;
			height: 100%;
			background-image: linear-gradient(to bottom, aqua, transparent);
			animation: zuo 1s linear infinite;
			animation-delay: 0.75s;
		}

		@keyframes zuo {
			0% {
				bottom: -100%;
			}

			50%,
			100% {
				bottom: 100%;
			}
		}

		.item1 {
			filter: hue-rotate(100deg);
		}

		.item3 {
			filter: hue-rotate(250deg);
		}
	</style>
	<body>
		<a href="#" class="item item1">
			HELLO
			<span></span>
			<span></span>
			<span></span>
			<span></span>
		</a>
		<a href="#" class="item item2">
			提交
			<span></span>
			<span></span>
			<span></span>
			<span></span>
		</a>
		<a href="#" class="item item3">
			确认
			<span></span>
			<span></span>
			<span></span>
			<span></span>
		</a>
	</body>
</html>